Transportable throttle device



Jul 8, 1924.-

J. C. CARLTON TRANSPORTABLE THROTTLE D BVICE Filed March 23, 9 2Sheets-Sheet l heots-$befl 2 J. C. CARLTON TRANSPORTABLE THROTTLE DEVICEJuly 8 1924.

Patented July 8, 1924.

UNITED STATES JACK C. CARLTON, or CINCINNATI, onio, AssreN'oR TO THECARLTON MACHINE 'roon PATENT OFFICE.

COMPANY OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

TRANSPO'RTABLE THROTTLE DEVICE.

Application filed March 23, 1922. Serial No. 546,138. I

To all whom it may concern: 1 7

Be it known that, LJACK C. CARLTON, a citizen of the United States, andresiding at Cincinnati, in the'county of Hamilton and State of Ohio,have invented a new and useful Improvement in Transportable ThrottleDevices, of which the following specification is a full disclosure.

My invention relates to a transportable throttle device for a fluidmotor whereby the motor can be controlledfrom a station most convenientto the operator.

An object of the inventionis to provide a fluid motor with a throttledevice for controlling the fluid supply and exhaust to and from themotor, the throttle having a flexible conduit cable connection with themotor, adapting the throttle to be transportative to a place ofutilization most convenient to theoperator.

Another object is to provide a portable toot treadle throttle deviceconnecting with a fluid motor by a flexible conduit cable, to throttlethe supply and exhaust of fluid to and from the opposite sides of'afluid motor piston.

Another object of the invention relates to the construction of a fluidmotor to render the same readily applicable to a commercial machine toolas power mechanism for actuating a hand operated lever or device of themachine tooL'the motor being controlled through a foot treadlecontroller, having an extended flexible connection with the motor,whereby the controller is transportable from one place of service toanother for accessibility to the operator of the machine at his workingpo-- sition.

The features of the invention will be more fully described in thedescription of the accompanying drawings, forming a part of thisspecification, in which:

Fig. 1- is a perspective view of a radial drill, equipped with myimproved pressure fluid controlling mechanism for operating a fluidmotor actuating clutch or clamping mechanism, for clamping the sleevecarrying the radial arm to the column upon whichthe sleeve is revolublymounted. Fig. 2 is a central vertical section of the column base of thedrill, illustrating the i tati ybindi g P -9 eeve to the colum mechanismemployed for frictionally nonand the lever mechanism for actuating thelever mechanism for the clamping mechanism.

Fig. 3 is a detail view illustrating in side elevation the fluid motorfor operating the clutch actuating mechanism, the motor fluid connectionleading to a foot actuated throttle Or valve'device for controlling thefluid for motor piston actuation, the valve device being shown in topplan view, with a portion thereof in horizontal section. I

Figs. 4: and 5 aredifferent side elevations of the foot throttle.

Fig. 6 is a top plan view of the fluid motor.

Fig. 7 is an end elevation thereof.

Fig. 8 is a central horizontal section through the motor.

In machine tools, especially those of large caliber, it is desirable'tohave the controlling mechanism for the machine within convenient accessor reach of the operator, to avoid the necessity of his leaving hisworking position to eflect'a c'o'ntrohas well as *to have a quick actingand easily operated control. 1

In this capacity, my improvement is admirably adapted to radial drills,for controlling the clamping --mechanism between the revolvable radialarm carrying sleeve and column supporting the sleeve, so that theoperator at any working position with in the working range of the toolcan quickly clamp or unclamp the sleeve for an arm swing adjustment,without being' required to leave his working position to operate theclamping mechanism. Although the disclosure herein pertains to radialdrills, it is evident that the transportable foot throttle, in flexibleconduit connection with the motor, and the motor, can find applicationin other fields and for other uses.

1 Referring to thedrawings, l'indicates the base of a radial drill uponwhich, at one end, is secured a vertical tubular column 2. The columnrevolubly supports a sleeve 3 concentrically engaged over the column.The sleeve 3 supports a horizontal arm 4, the arm being verticallyadjustable upon the sleeve and carries ahead-stock 5 horizontal ly adjustable'upon the arm.

The sleeve is clamped to the column by friction brake mechanism, which,however,

ll b e e re t are a eni??? ring 6, interposed between the column andsleeve and preferably at the base of the sleeve, the ring being expandedby a ringspreading device operated by a lever arm 7. The brake mechanismper se embodies a distinct improvement and is made the subjectematter ofa separate applicatlon, for a more complete detail description of wh1ch. reference may be had to such application, filed of even dateherewith, Serial No. 546,136.

A link 8 at one end connects with the arm 7 and the opposite end thereofconnects with a lever arm 9 fixed on the end of the rock shaft 10,journaled in a bearing base of the column and in a bearing 11 in thebase 1. The outer end of the shaft 10 has a hand lever 12 fixed thereonfor manually controlling the ring 6, for clamping or releasing thesleeve. The hand lever 12 is provided with depending ears 13, 13, forconnecting the piston rod 14, of the fluid motor 15, to the lever. Theconnection is preferablymade by link 16 pivotally connected to andbetween ears 13, 13, at one end and to the yoke head 17 of the pistonrod 14, to provide a flexible connection between the piston rod and handlever accommodating for the arc of swing of the lever ears.

The fluid motor 15, comprises a cylinder 18, engaged through acylindrical bracketbody 19, split for frictionally clamping the cylinderwithin the bracket body. The bracket body is provided with a lateralextension 20 for bolting the bracket to the top surface of the base 1,and suspendingly hanging the cylinder axially parallel with the faceside of the machine base 1. The forward end of the cylinder has a headplate 21, screw threaded into the end of the cylinder and provided witha stufling-box through which the piston rod 14 is engaged. The-inner endof the piston rod has a piston connected thereto, consisting of a pairof oppositely disposed packin'gs 22, 22, mounted between disks 23, 24,secured together by screws 25, the disk 24 being secured upon the end ofthe piston. rod 14. Fluid connections tap into the opposite ends of thecylinder, which alternately provide inlet and exhaust conduits foradmitting and exhausting the fluid from opposite sides of the piston forpiston reciprocation.

As shown, elbow fittings 26, 27, are respectively threaded into theopposite ends of the cylinder and coupled respectively upon the .ends ofthe flexible tubes or hose 28, 29, whichextend through a'flexibleconduit 3O tothe foot throttle. The conduit 30, at one end, is fixedwithin a hub 31 upon the end of bracket extension 32, of the bracket 20,while the opposite end ofthe conduit '30 is fixed within a hub 33 of thebody 34 of the foot throttle. The conduit protects the several lines ofhose and compactly combines them as a unit. A third or main fluid supplyline or hose 35 also extends through the conduit to the foot throttle.

The foot throttle comprises a body or casting 34, having an extendedbase 36 apertured to receive the treadle 37 journaled upon the rod 38,mounted within the base The treadle is provided with an upwardlyextended arm 37*, having an adjusting screw 38 transversely extendedtherethrough, adapted to engage the outer end of a slide valve 39. Thearm 37 has a lug extending from its rear side for engagement with thetop surface of the base to limit the return stroke or movement of thetreadle. The body 34 is bored and cored to form a valve chest into whichthe ends of the fluid lines or tubes 28, 29, 35, tap, coinmunicatingrespectively with chambers 40, 41, 42, formed by a valve sleeve 43engaged into the base of the body. The slide valve 39 slides within thevalve sleeve 43 for covering and uncovering ports as apertures throughthe sleeve 43, for controlling the fluid supply and exhaust to and fromthe motor. The inner end of the slide valve engages a spring 44 seatedagainst a plug 45 threaded within the valve chest base in the body. Theplug is provided with openings 46 therethrough communicating with the interi'or of the valve sleeve as exhaust ports. The forward stroke of thevalve is limited by an adjustable stop pin 47 engaged through the plug45.

The valve is provided intermediately with an annular groove forming avalve chamber 48, between the sleeve and valve, for estab lishingcommunication alternately between the main fluid supply pipe and thepipes or tubes connecting with the opposite ends of the motor cylinder.

The chamber 40, at the left side of the valve chest, connect-s throughtube 28, with the left end of the motor cylinder, and chamber 41 at theright side of the valve chest connects through ,tube 29 with the rightend of the motor cylinder. The chamber 40 communicates with theextension'of the valve sleeve, through apertures 49,49, at opposite endsof the chamber, and chamber 41 similarly communicates with the interiorof the sleeve through apertures 50, 50, through thesleeve at oppositeends of said chamber for the supply and exhaust control.

The supply chamber 42 communicates with the valve chamber 48, throughapertures 51, through the sleeve and alternately communicates with thechamloersv 40, 41,

through the control of the valve.

Thus,when thevalve is in its normal or foremost position, as shown inFig. 3, the

valve chamber 48 establishes communication between the main supplychamber 42 and chamber 41 directing the fluid pressure against the rightend of the piston, for moving the piston to the left. In this positionof the valve, the chamber 40, through the left end perforation 49, isopen to the atmoshere throiwh the sleeve and vent 0 enin s The operator,for a throttle adjustment in one direction, depresses the treadle andholds the same in its depressed position for a period desired for onedirecti on of operation of the drill sleeve clamping mechanism and uponrelease of the treadle, the spring 44 automatically moves the valve in areturn direction for a reversal.

In practice, the normal position of the throttle is utilized for aclamping control,

clamping the sleeve to the column. The

fluid pressure is maintained against the piston to hold the saidclamping mechanism under pressure in a position which will retain andhold the clamping mechanism in its active position, so that the columnis always locked to the sleeve, while the machine tool is in operation.

Should the operator desire to swing the drill arm, the throttle treadleis depressed, controlling the fluid pressure to and from the motor for areversing or clamping mechanism releasing operation. The arm and itssleeve are instantly locked to the column as soon as the operatorreleases the throttle treadle. The throttle is portable and can bestationed at any convenient accessible point for the operator, theadvantages of such portability and accessibility being readily apparent.

The throttle and motor, as a unit, are readily applied to any of thecommercial machines, and the motor is so applicable at a location mostconvenient for making connections with the mechanism to be actuatedthereby.

Having described my invention, I claim:

1. A radial drill column clamping device comprising a fluid motoroperated clamp, a fluid motor, a transportable throttle for con trollingfluid pressure to and exhaust from said motor, a flexible primary supplyconduit extending from the motor to the throttle and communicating withsaid throttle, secondary flexible conduits attached to said motor andthrottle communicating with both, and alternately with said primaryconduit through said throttle, and a flexible protecting cable enclosingall conduits and attached at opposite ends to said motor and throttle.

2. A radial drill column clamping device comprising a fluid motoroperated clamp, a fluid actuated motor comprising a cylinder, and apiston movable in said cylinder, a transportable throttle forcontrolling fluid supply to and exhaust from said motor, a flexibleprimary supply conduit secured to said motor and throttle andcommunicating with said throttle, secondary flexible conduits attachedto said motor and throttle, communicating with said throttle and motorrespectively at relatively opposite sides of said piston, andalternately with said primary supply conduit through said throttle, anda flexible cable enclosing all conduits attached at opposite endsrespectively to said motor and throttle.

3. In a radial drill, the combination of a column, asleeve rotatablyadjustable upon said column, clamping means for non-rotatively clampingsaid sleeves to the column, power mechanisms for actuating said clampingmeans, and a transportable throttle valve for controlling said powermechanism, having flexible conduit connection with said power controlmechanism, said throttlenormally effective for maintaining said powermechanism and correspondingly said clamping means in position forclamping said sleeve to the column, said throttle valve being manuallyoperable for controlling the power mechanism for clamping release.

4. In a radial drill, the combination of a column, a sleeve rotatablyadjustable upon said column, clamping means for non-rotatively clampingsaid sleeve to the column, power mechanism for actuating said clampingmeans, and a throttle valve for controlling said power mechanism,normally effective for maintaining said power mechanism andcorrespondingly said clamping means in position for clamping said sleevetothe column, said throttle being manually operable for controlling thepower mechanism for clamping release.

In witness whereof, I hereunto subscribe my name, as attested by the twosubscribing witnesses.

JACK C. CARLTON. Witnesses:

R. Krs'rm, L. A. BECK.

